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The compressive sensing (CS) theory shows that real signals can be exactly recovered from very few samplings. Inspired by the CS theory, the interior problem in computed tomography is proved uniquely solvable by minimizing the region-of-interest’s total variation if the imaging object is piecewise constant or polynomial. This is called CS-based interior tomography. However, the CS-based algorithms...
The digital community is the foundation for digital city construction. The paper introduces the technical route and work flow of the realization of digital community 3D modeling and virtual roaming. It mainly discusses the core techniques of model construction, texture mapping and scene optimization in 3D environment. Finally, it summarizes some technologies and methods in constructing digital community.
Virtual city is an important part of the digital city, and it is an important way to show the information of three-dimensional of a city. Acting as the virtual environment platform for the "global information system" and the development of digital cities, virtual city plays a core role in urban planning, real estate, community management, as well as city tourism, urban construction, and...
Modern urban infrastructure needs a comprehensive and integrated information science and technology. Global Position System (GPS), Geographic Information System (GIS), Digital Photogrammetry and Remote Sensing (RS) and other spatial information technologies are it's core techniques. Products of digital photogrammetry and remote sensing are its basic information resource. The key tasks of modern urban...
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